CN108555360B - Uniform thickness covering type part milling is not cut into neutral line method of deploying to one kind - Google Patents
Uniform thickness covering type part milling is not cut into neutral line method of deploying to one kind Download PDFInfo
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- CN108555360B CN108555360B CN201810678117.3A CN201810678117A CN108555360B CN 108555360 B CN108555360 B CN 108555360B CN 201810678117 A CN201810678117 A CN 201810678117A CN 108555360 B CN108555360 B CN 108555360B
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- thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/13—Surface milling of plates, sheets or strips
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
- B23C3/16—Working surfaces curved in two directions
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Abstract
The invention proposes a kind of not uniform thickness covering type part millings to be cut into neutral line method of deploying.This method is that the method for deploying of the single continuous near neutral layer of part is sought based on thickness accounting.By measuring the thickness and surface area of each feature on not uniform thickness covering class part, using thickness accounting, forming expansion neutral line after not uniform thickness covering class part elder generation plane milling is sought.This method has fully considered the influence of material different materials thickness and different area accounting to neutral thickness degree, extension and compression to different-thickness have carried out optimal choice, under the premise of being conducive to unfolding calculation and process forming, the best fit with true neutral line is realized.
Description
Technical field
The invention belongs to aircraft digital manufacturing fields, and being related to one kind, uniform thickness covering type part milling is not cut into neutral line exhibition
The extraction of root.
Background technique
Traditional covering class part forming uses and first presses uniform thickness Blank Development, thin inside milling after stretch bending or press shaping die
Save the mode of feature.Covering class part is in forming process, and material inner surface compression, outer surface stretches, in moulding material
Between have one layer of constant neutral line.Using the theory that contoured neutralizing layer is constant, rear milling easily is shaped to covering class part
Feature carries out Blank Development calculating.
To reduce part forming tooling, part not uniform thickness covering class part attempt after first all features of plane milling part at
The mode of shape.The plane milling of uniform thickness covering class part, which is not essential, wants accurate expansion model, since part is more in forming process
Gauge strips characteristic part, the practical neutral line of uniform thickness covering class part is not discontinuously neutral with the non-single curvature of changing features
Layer curved surface does not meet the requirement that part expansion mean camber is single continual curvature developable surface, therefore cannot be fully according to covering
The true neutral line of part carries out unfolding calculation.
Conventional way is to carry out simplifying calculating according to the neutral line of the maximum gauge of part, however, due to part thickness
Change it is more, when part thickness change in size is larger, maximum gauge simplify neutral line and practical neutral line deviation it is bigger, press most
Part size differs greatly with theoretical model after big thickness simplifies calculating forming, and part is overproof serious.
Summary of the invention
To solve the above-mentioned problems, the invention proposes one kind is sought in the single continuous approximation of part based on thickness accounting
The method of deploying of property layer.By measuring the thickness and surface area of each feature on not uniform thickness covering class part, thickness is utilized
Accounting seeks forming expansion neutral line after not uniform thickness covering class part elder generation plane milling.
Specific step is as follows for used technical solution of the invention:
1. pair not the thickness distribution of uniform thickness covering class part is not measured and is recorded
(1-1) analyzes covering class part feature, to the thickness d of feature each on coveringnMeasure record
(1-2) is according to measurement data dn, identical thickness is sorted out, the different-thickness of covering class part is remembered
Record；
2. the thickness distribution according to not uniform thickness covering class part carries out area measurement
The different-thickness of (2-1) according to covering class part, to corresponding to surface shared by the feature of thickness on covering class part
Product is measured and is recorded
(2-2) merges summation s to surface area shared by the identical feature of thicknessn
(2-3) is by all area s of different-thicknessnIt sums, calculates the sum of all feature areas of part s0；
3. the calculating of neutral line t ' is unfolded
(3-1) foundation calculation formula, by each thickness d in thickness classification chart measured by covering class partnAnd correspondence
Area snAnd the sum of gross area of all features of part s0It brings into calculation formula, is calculated according to area accounting
Optimal expansion neutral line thickness t ' is shaped after the plane milling of thick covering class part elder generation
Calculation formula is as follows:
Wherein: k metal plate neutrality layer coefficients
d1The thickness of first feature on covering class part
d2The thickness of second feature on covering class part
dnThe thickness of n-th of feature on covering class part
s1Surface area shared by the feature of first thickness and
s2Surface area shared by the feature of second thickness and
snSurface area shared by the feature of n-th of thickness and
s0The sum of gross area
4. carrying out part expansion modeling according to calculated neutral line t ' value.
(4-1) establishes expansion front curve according to expansion neutral line thickness t ', and carries out unfolding calculation, bent after generation expansion
Face；
Before the expansion of (4-2) foundation, rear curved surface is unfolded, establishes the mapping pass of all features of covering class part expansion front and back
System；
(4-3) compares the product feature of covering class part and the characteristic curve after expansion and reference line establishes the covering after expansion
The expansion digital-to-analogue of class part.
This method has fully considered the influence of material different materials thickness and different area accounting to neutral thickness degree, to not
The extension and compression of stack pile have carried out optimal choice, under the premise of being conducive to unfolding calculation and process forming, realize
In the best fit of true neutral line.
Detailed description of the invention
Fig. 1 part section and neutral line figure
Fig. 2 part thickness categorised statistical form
Characteristic pattern before Fig. 3 part is unfolded
Comparison diagram is mapped after the expansion of Fig. 4 part
Illustraton of model before Fig. 5 part is unfolded
Model comparison diagram after the expansion of Fig. 6 part
Explanation is numbered in figure: 1, not uniform thickness covering class part section；2, true neutral line；3, neutral line is unfolded；4, it is unfolded
Preceding characteristic curve；5, the characteristic curve after being unfolded；6, a kind of not uniform thickness covering class part；7, expansion model.
Specific embodiment
According to Fig. 1-Fig. 6, not the expansion of 6 neutral line of uniform thickness covering class part the following steps are included:
1. pair not the thickness distribution of uniform thickness covering class part 6 does not carry out preliminary analysis classification:
(1-1) analyzes the feature of not uniform thickness covering class part 6, to the thickness d of each featurenMeasure record.
(1-2) is according to measurement data dn, identical thickness is sorted out, it is thick to the difference of not uniform thickness covering class part 6
Degree is recorded, as shown in Figure 2；
2. the thickness distribution according to not uniform thickness covering class part 6 carries out area measurement
The different-thickness of (2-1) according to not uniform thickness covering class part 6, surface area shared by the feature to same thickness carry out
Measurement record, as shown in Figure 2；
(2-2) merges summation to surface area shared by the identical feature of thickness, by each thickness dnWith it is corresponding
Area snIt is recorded, as shown in Figure 2；
(2-3) is by all area s of different-thicknessnIt sums, calculates the sum of all feature areas of part s0, such as Fig. 2
It is shown；
3. the calculating of neutral line 3 is unfolded
Foundation calculation formula,
Wherein: k metal plate neutrality layer coefficients
d1The thickness of first feature on covering class part
d2The thickness of second feature on covering class part
dnThe thickness of n-th of feature on covering class part
s1Surface area shared by the feature of first thickness and
s2Surface area shared by the feature of second thickness and
snSurface area shared by the feature of n-th of thickness and
s0The sum of gross area
By each thickness d in thickness classification chart measured by not uniform thickness covering class part 6nWith corresponding area snAnd
The sum of gross area s0It brings into calculation formula, is shaped most after calculating the first milling of not uniform thickness covering class part 6 according to area accounting
Good 3 thickness t ' of expansion neutral line
It calculates as follows:
As shown in Figure 1, the true neutral line 2 of part and expansion neutral line 3 do not compare in uniform thickness covering class part section 1,
It can be seen that neutral line 3 is the closest single continuous developable surface of true neutral line 2.
4. being unfolded to model according to calculated 3 thickness t ' carry out part of neutral line.
(4-1) establishes expansion front curve according to expansion 3 thickness t ' of neutral line, and carries out unfolding calculation, bent after generation expansion
Face；
Before the expansion of (4-2) foundation, rear curved surface is unfolded, characteristic curve 4 before the not expansion of uniform thickness covering class part 6 is reflected
It penetrates, generates characteristic curve 5 after expansion；
Characteristic curve 5 establishes the covering class after expansion after (4-3) compares the not product feature and expansion of uniform thickness covering class part 6
The expansion model 7 of part.
Claims (1)
1. a kind of not uniform thickness covering type part milling is cut into neutral line method of deploying, it is characterised in that include the following steps:
1-1 is measured and is recorded to the thickness distribution of not uniform thickness covering class part
Covering class part feature is analyzed, to the thickness d of feature each on coveringnRecord is measured,
According to measurement data dn, identical thickness is sorted out, the different-thickness of covering class part is recorded；
1-2 carries out area measurement according to the thickness distribution of not uniform thickness covering class part
According to the different-thickness of covering class part, measured to surface area shared by the feature of thickness is corresponded on covering class part
And record,
Summation s is merged to surface area shared by the identical feature of thicknessn,
By all area s of different-thicknessnIt sums, calculates the sum of all feature areas of part s0；
The calculating of 1-3 expansion neutral line t '
According to calculation formula, by each thickness d in thickness classification chart measured by covering class partnWith corresponding area snWith
And the sum of gross area of all features of part s0It brings into calculation formula, calculates not uniform thickness covering class zero according to area accounting
Optimal expansion neutral line thickness t ' is shaped after the plane milling of part elder generation,
Calculation formula is as follows:
Wherein: k metal plate neutrality layer coefficients
d1The thickness of first feature on covering class part
d2The thickness of second feature on covering class part
dnThe thickness of n-th of feature on covering class part
s1Surface area shared by the feature of first thickness and
s2Surface area shared by the feature of second thickness and
snSurface area shared by the feature of n-th of thickness and
s0The sum of gross area；
1-4 carries out part expansion modeling according to calculated neutral line t ' value
According to expansion neutral line thickness t ', expansion front curve is established, and carries out unfolding calculation, generates expansion rear curved surface,
Before foundation expansion, rear curved surface is unfolded, establishes the mapping relations of all features of covering class part expansion front and back,
It compares the product feature of covering class part and the characteristic curve after expansion and reference line establishes the covering class part after expansion
Digital-to-analogue is unfolded.
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| CN113673043B (en) * | 2020-05-13 | 2024-03-01 | 上海飞机制造有限公司 | Unfolding method of variable-thickness skin based on unfolding layer |
| CN112287464A (en) * | 2020-11-17 | 2021-01-29 | 西安飞机工业（集团）有限责任公司 | Method for unfolding neutral layer of continuously variable-thickness skin part |
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| CN102591255A (en) * | 2012-03-22 | 2012-07-18 | 沈阳飞机工业（集团）有限公司 | Unfolding method for high-bar integral wall board |
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